214 ANIMAL INTELLIGENCE 
clear evidence of both enjoyment and disgust through 
taste, at all events. 
The general advancement of the animal is well shown 
in its behaviour towards blistering fluid on the 10th day. 
By the 20th day smell had become a powerful moving 
force in the animal, as it always will continue to be. 
The manner in which a sleeping dog, young or old, 
is affected by the presence of food with a pronounced 
smell, is very impressive to one who witnesses it. 
At so early a period as the 24th day this puppy’s 
sense of smell was so well developed, it will be noticed, 
that he followed a bone by its aid quite well. At this 
period he used his eyes, as well as his nose, to guide him. 
At this date also hearing was good—in fact, by the 
25th day the dog had reached a period of fair develop- 
ment of all his senses, and with considerable motor 
power, which, of course, also implies a corresponding 
development of the muscular sense. Hearing seems to 
be the most rapidly developed of all the senses, we. the 
period from its first beginnings to its greatest acuteness 
is relatively short. 
The pleasure of the puppy on having its head stroked, 
on the 31st day, is noteworthy. 
The Mongrel Dog and the Pure-Bred Dog Compared. 
In my first paper on the dog, certain differences were 
noted between two varieties of pure-bred dogs—the one 
large and the other small, viz. between the St Bernard 
and the Bedlington terrier. I now propose to compare 
the pure-bred and the mongrel, chiefly on the basis of 
my records in the earlier and in this paper. 
The mongrel showed more vigour at birth, and shortly 
after, as evidenced to me at a distance, by the voice. 
He also seemed to be somewhat less influenced by cold, 
though more persistent, or at least more successful, in 
getting all the heat possible from the dam. 
